Installed 4 times, RocketChat failed to start

Hi, I just followed this guides

trying to install this RocketChat, when checking the status, it returns an error.

I am able to ping from another computer but the web browser does not connect.
The RocketChat documentation is not as good as I was expecting.
Please help, I have all this week trying to fix this. I followed this instructions 4 times this day.
What am I doing wrong?

Mar 28 01:51:25 rchatserver rocketchat[10579]: Meteor requires Node V12.0.0 or later

Did you miss the steps where node.js was installed?